fix(dash-spv): re-anchor incompatible shared storage

[llbartekll]

Summary

• compare the current wallets' required SPV start height with the existing network-scoped storage range during DashSpvClient construction
• clear and re-anchor the coherent SPV store when the cache starts after the oldest required wallet history
• preserve compatible caches and retain the mainnet HD-wallet floor
• add regression coverage for recent-cache → old-wallet import, compatible cache reuse, and mainnet floor behavior

User-visible effect

After a near-tip wallet is deleted, importing an older wallet into the same app installation automatically discards the too-recent shared SPV cache and scans the required historical range. No manual Clear & resync or app restart is required.

Test plan

• older_testnet_wallet_reanchors_recent_shared_storage_to_genesis
• storage_that_starts_before_wallet_requirement_is_preserved
• mainnet_reanchor_respects_hd_wallet_sync_floor

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• Commit unit tests in branch codex/spv-cache-reanchor

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[codecov]

Codecov Report

❌ Patch coverage is 99.19355% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 74.49%. Comparing base (19690d3) to head (2a067e9).

Files with missing lines	Patch %	Lines
dash-spv/src/client/mod.rs	99.12%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #910      +/-   ##
==========================================
- Coverage   74.54%   74.49%   -0.05%     
==========================================
  Files         327      327              
  Lines       75032    75152     +120     
==========================================
+ Hits        55936    55988      +52     
- Misses      19096    19164      +68     

Flag	Coverage Δ
core	77.29% <ø> (ø)
ffi	50.36% <ø> (-0.59%)	⬇️
rpc	20.00% <ø> (ø)
spv	91.22% <99.19%> (+0.01%)	⬆️
wallet	74.41% <ø> (ø)

Files with missing lines	Coverage Δ
dash-spv/src/client/lifecycle.rs	92.50% <100.00%> (+0.23%)	⬆️
dash-spv/src/client/mod.rs	99.41% <99.12%> (-0.59%)	⬇️

... and 18 files with indirect coverage changes